Improvement in molds for casting



UNITED STATES PATENT ,OFFICEQ s. A. coR-sER, OENORTHAMPTON,MASSACHUSETTS, Assrenon TO HIMSELF AND I." A. NIMS, or SAME PLACE.

IMPROVEMENT m MOLDS FOR CASTING.

Specification forming part of Letters Patent No. '29, I 23, dated July- 10, 1860.

T0 at whom; it may concern.-

Be it known th at I, S. A. CORSER', of'llorthampton, in the county of Hampshire and State of Massachusetts, have invented a new and useful Device for Forming Sand Molds for Casting; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the an A represents a circular base, supported at a suitable height by legs a, and B B are-two uprights attached to the base A and connected a short distance above the base by a traversebar, b. On the upper end of the upright-s B B a shaft, 0,- is placed, said shaft having a central hearing or support, D. On one end of the shaft 0 a toothed wheel, 1*], is placed, into which-a pinion, F,- gears, said pinion being on a driving-shaft, G. On the shaft 0 two eccentries, H H, are placed in opposite potuions, each eccentric having a rod, I, attacheuto it. To the lower end of each rod 1 a squase bar, J, is connected by a joint, 0, the bars being fitted in guides at in the traverse-bar On the base A there are two annular wa i, c e, on which a plate or carriage, K, is fit. ed and allowed to move freely, and on this carriage the flask containing the pattern is placed.

The plate or carriage may he-made in the :i'orm ofa complete disk or circular rotating table, 'fif-desired, instead of being made in the form of segments. In either case it is obvious that by, the employment of circular ways the operator may prepare and place upon the ways other molds or flasks while those already be- 'neath the :plungers are being operated upon. To-the lower end of each bar J a plunger is attached (see Fig. 1) in which a plunger, L, is attached. to one bar J and a plunger, M,

- verse form.

to the other. The. plunger L, it will be seen, "i'sa semispherical shell, and is designed for forming molds for casting balls or spheres.

N is a flaekwhich contains the pattern 0 of,

the balls or spheres to be'cast. The interior of the plunger L corresponds inversely with the pattern 0. P is a supplemental flask, which is placed on the flask N to increase the capacity of the latter, so that itmay hold the requisite quantity of loose or uncompressed sand to form the mold.

In forming a 'mold for the casting of a ball or sphere, the flask N is placed on the carriage K, and the supplemental flask I is fitted on the flask N, and the flasks filled with sand. The carriage K is then moved around underne th the plunger L, which is directly over tl' space between the ways 6 c. The shaft 0 is then rotated, and the plunger L descends into the supplemental flask P and presses the sand into flask N, the'sand being snugly conipressed around the pattern 0, the sand being compressed equally all around the pattern on account of the universally-corresponding form of thefplunger L. This will be fully understood by referring to Fig; 1. It will be seen that if a flat plunger were used, the sand at the center of the flask would be greatly compressed, while that near the sides would be subjected to comparatively little pressure. The mold, therefore, would be formed of unequally-compressed sand. This difficulty of unequal pressure has hitherto prevented the adoption of machinery for the purposes of sand molding, a difficulty fully obviated by my invention.

From the above description, it will be seen that whatever the form". of the pattern may be, the face side of the plunger must correspond inverselythercto or have an approximate in- The plunger M has'simply a recess made in its under or face side, so as to leave a flange, f, all around its edge. This form of plunger maybe usedin forming cylindrical, or those for casting cylindrical articles of rather small diameter. For this purpose the flange f would be suflicient, as it forces down the sand at the sides of its flask Q toward the patterns R R, two of which are placed in the flask. When the sand is compressed into theflask at one side of the pattern, the

flask is inverted, the supplen'iental flask being detached, the flask being inverted by raising the flask and turning it on t'runnions and then lowering it, placing the supplementalflask on it, filing the flask with sand and agained justing' it beneath the properplunger. It will be seen that the supplemental flasks-are essential, for they permit sufficient loose sand to be placed in the flasks to compensate-for the compression of the sand under the action of the plungers. It will also besccn that the readily adjusting flasks underneath plungers,

for this has been previously done; neither do I claim providing a flask with trunnions in which, at the proper time, they may be suspended for inversion; but- I do claimas'new and desire to secure by Letters Patent 1. The employment of a mold-carriage that moves in, acircle, in combination. with the compression-plungers-L M, substantially as and for the purpose herein shown and described.

2. The employment, in combination, with the flasks NQ, of pistons L M ,that have their faces shaped to correspond with the form of the article to be molded, so that the C0111- pression of the sand within the flask will be equal in every part, as set forth.

3. The employment of the supplemental molds P P, in combination with the pistons L M and flasks N Q, as and for the purposes herein shown and described.

Ems PARsoNs, 0. A HILLMAN. 

